How To Calculate Floor Deflection

Enter your floor joist information and then hit calculate deflection to find out your floor rating.

How to calculate floor deflection.

The total deflection at the center of the beam is. Deflection of shafts with two bearings. Divide the total span of the floor joists in inches by 360 to determine the maximum amount the floor can give in the middle under a live load of 40 lb sq. Point a d 12 05 mm 0 47 in point b d 15 5 mm 0 61 in.

The deflection values for point a the shortest distance from the support to the tip of the cantilever and point b are. The modulus of elasticity depends on the beam s material. Decreasing the span length is going to most dramatically change your deflection. If you add a support beam columns in the middle of your joist span that will decrease your joist span from 20 down to 10.

The uniform load on the beam the shaft or actuator s own weight will induce maximum deflection at the center of the beam which can be calculated as. To calculate a specific value the tile council of north america tcna offers a standard formula. The deflection for the entire floor shall not exceed 1 1000 i e. Maximum deflection is at point b near the center of the overhang.

Hereof how do you calculate floor deflection. If you have engineered truss or i beam type joists please do not use this calculator. Many tile contractors can judge a floor s deflection by walking around. Ft plus any long term deflection due to the weight of the floor.

Jazman or anyone else with this info where can i get a chart like mentioned or find info on calculating deflection. Deflection due to the applied load in this condition is calculated as. Thanks for any help. Ft plus any long term deflection due to the weight of the floor.

We can define the stiffness of the beam by multiplying the beam s modulus of elasticity e by its moment of inertia i. I have a bunch of tile to do in my house and would like to learn how to calculate deflection. Since this is a simply supported beam the applied load can be modeled as a point load at the center of the beam for the worst case scenario. This calculator is designed to work with dimensional lumber only.

All materials beams and floor will be manufactured from the same material which has a tensile modulusof 1 3e 10n m. This will lead to an 8x reduction of deflection deflection should be 15 of what it is now. The deflected contour of the floor is shown in fig.